From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756675AbbGVODW (ORCPT ); Wed, 22 Jul 2015 10:03:22 -0400 Received: from fw-tnat.cambridge.arm.com ([217.140.96.140]:37743 "EHLO cam-smtp0.cambridge.arm.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756174AbbGVODV (ORCPT ); Wed, 22 Jul 2015 10:03:21 -0400 From: Punit Agrawal To: linux-pm@vger.kernel.org Cc: Punit Agrawal , lm-sensors@lm-sensors.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, viresh.kumar@linaro.org, Rob Herring , Mark Rutland Subject: [PATCH 1/9] devicetree: bindings: Add optional dynamic-power-coefficient property Date: Wed, 22 Jul 2015 15:02:35 +0100 Message-Id: <1437573763-6525-2-git-send-email-punit.agrawal@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1437573763-6525-1-git-send-email-punit.agrawal@arm.com> References: <1437573763-6525-1-git-send-email-punit.agrawal@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The dynamic power consumption of a device is proportional to the square of voltage (V) and the clock frequency (f). It can be expressed as Pdyn = dynamic-power-coefficient * V^2 * f. The dynamic-power-coefficient property represents an indicative running time dynamic power coefficient in fundamental units of mw/MHz/uVolt^2 and can be used in the above formula to calculate the dynamic power in mW. Signed-off-by: Punit Agrawal Cc: Rob Herring Cc: Mark Rutland --- Documentation/devicetree/bindings/arm/cpus.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt index d6b794c..c32bfac 100644 --- a/Documentation/devicetree/bindings/arm/cpus.txt +++ b/Documentation/devicetree/bindings/arm/cpus.txt @@ -239,6 +239,21 @@ nodes to be present and contain the properties described below. Definition: Specifies the syscon node controlling the cpu core power domains. + - dynamic-power-coefficient + Usage: optional + Value type: + Definition: A u32 value that represents an indicative + running time dynamic power coefficient in + fundamental units of mW/MHz/uVolt^2. + + The dynamic energy consumption of the CPU + is proportional to the square of the + Voltage (V) and the clock frequency (f). + + Pdyn = dynamic-power-coefficient * V^2 * f + + where voltage is in uV, frequency is in MHz. + Example 1 (dual-cluster big.LITTLE system 32-bit): cpus { -- 2.1.4